All these trees once where too small to be sold for money - hence they survived as only witness of a once most beautiful high jungle with huge jungle trees and dense jungle vegetation and jungle animal life.
While some of the huge jungle trees may take as little as 500-1000 years to grow. The actual harmony of a virgin jungle untouched by businessmen and politicians may take up to several thousands of years evolution and selective processes until a jungle is strong and healthy enough to sustain the planet and our all lives.